STAMPING APPARATUS

Abstract

A stamping apparatus configured to stamp a material configured as a flat paper or cardboard web, the stamping apparatus including a machine frame; an upper part including at least one upper stamping tool configured as a male die; and a lower part including at least one lower stamping tool configured as a female die wherein the upper part is arranged movable in a linear manner relative to the machine frame, wherein the lower part is fixed at the machine frame, wherein an intermediary space is provided between the male die and the female die, wherein the material to be stamped is movable through the intermediary space in a direction perpendicular to a direction of a relative movement between the upper part and the lower part, wherein the material to be stamped is stampable by the relative movement between the upper part and the lower part.

Claims

1. A stamping apparatus configured to stamp a material configured as a flat paper or cardboard web, the stamping apparatus comprising: a machine frame; an upper part including at least one upper stamping tool configured as a male die; and a lower part including at least one lower stamping tool configured as a female die wherein the upper part is arranged movable in a linear manner relative to the machine frame, wherein the lower part is fixed at the machine frame, wherein an intermediary space is provided between the male die and the female die, wherein the material to be stamped is movable through the intermediary space in a direction perpendicular to a direction of a relative movement between the upper part and the lower part, wherein the material to be stamped is stampable by the relative movement between the upper part and the lower part due to an engagement of at least one upper stamping tool of the upper part in an associated at least one lower stamping tool of the lower part, wherein each of the at least one upper stamping tool and the at least one lower stamping tool includes at least one cutting element respectively including at least one circumferential cutting edge and wherein at least one cutting edge arranged in the upper part cooperates with at least one cutting edge arranged in the lower part as opposite cutting edges, wherein the at least one cutting element is connected with the at least one upper stamping tool and the at least one lower stamping tool in a disengageable manner.

2. The stamping apparatus according to claim 1, wherein the upper part includes plural upper stamping tools respectively including a cutting element.

3. The stamping apparatus according to claim 2, wherein the upper part includes a carrier plate where the plural upper stamping tools are attached so that they protrude beyond the carrier plate in a direction towards the lower part.

4. The stamping apparatus according to claim 1, wherein the male die includes exactly one cutting element including plural cutting edges.

5. The stamping apparatus according to claim 4, wherein the exactly one cutting element is configured plate shaped and contacts a parallel carrier plate flat and is connected with the parallel carrier plate, wherein the parallel carrier plate includes cut outs into which the cutting elements of the male die are configured to penetrate.

6. The stamping apparatus according to claim 1, wherein the male die includes plural cutting elements respectively including at least one cutting edge.

7. The stamping apparatus according to claim 1, wherein the at least one cutting element is configured conical so that a surface line in a sectional view transversal to an axial direction of the at least one cutting element extends at an angle relative to the axial direction.

8. The stamping apparatus according to claim 1, wherein the at least one cutting element terminates flush with a top side of the at least one upper stamping tool.

9. The stamping apparatus according to claim 1, further comprising a separation plane between the at least one upper stamping tool and the at least one cutting element, wherein the separation plane is orthogonal to a direction of a relative movement between the upper part and the lower part.

10. The stamping apparatus according to claim 1, the at least one cutting edge of at least one of the cutting element is configured circumferentially closed.

11. The stamping apparatus according to claim 1, further comprising: a centering element configured as a centering pin through which the at least one cutting element is alignable in a defined position at a base element of the at least one upper stamping tool and the at least one lower stamping tool.

12. The stamping apparatus according to claim 1, further comprising: a centering element configured to center the at least one cutting element.

13. The stamping apparatus according to claim 12, wherein the centering element includes a centering collar.

14. The stamping apparatus according to claim 13, further comprising: a centering recess configured to receive the centering element.

15. The stamping apparatus according to claim 1, wherein the at least one cutting element of the upper part or the at least one cutting element of the lower part is annular, circular ring shaped or frame shaped.

16. The stamping apparatus according to claim 1, further comprising: at least one annular or circular ring shaped centering element arranged between the at least one cutting element and a base element of the upper part or the lower part, and wherein the at least one annular or circular ring shaped centering element and the at least one cutting element are fixable at one another by positive form locking against a movement in a direction perpendicular to the direction of a relative movement between the upper part and the lower part, but movable as a subassembly relative to the base element in various directions relative to the direction of the relative movement between the upper part and the lower part and are movable into different positions relative to the base element where they are fixable.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The invention is subsequently described based on advantageous embodiments with reference to drawing figures, wherein:

[0036] FIG. 1 illustrates a schematic perspective view of a male die of the stamping tool according to the invention from above;

[0037] FIG. 2 illustrates a schematic perspective view of the male die of the stamping tool according to the invention from below;

[0038] FIG. 3 illustrates a schematic exploded view of the stamping apparatus according to the invention from an upper right;

[0039] FIG. 4 illustrates a schematic exploded view of the stamping apparatus according to the invention from a lower right;

[0040] FIG. 5 illustrates a schematic exploded view of a lower part of the stamping apparatus according to the invention;

[0041] FIG. 6 illustrates a schematic exploded view of the female die of the stamping tool including a cutting element;

[0042] FIG. 7 illustrates a schematic perspective view and sectional view of a stamping apparatus according to another embodiment, wherein the female die includes plural cutting elements;

[0043] FIG. 8 illustrates a detail view of the female die according to FIG. 7;

[0044] FIG. 9 illustrates a schematic perspective view from below and a sectional view of a stamping apparatus including a male die according to another advantageous embodiment;

[0045] FIG. 10 illustrates the stamping apparatus of FIG. 9 from above;

[0046] FIG. 11 illustrates a schematic perspective view from above and a sectional view of a cutting element of a male die according to another advantageous embodiment;

[0047] FIG. 12 illustrates a schematic exploded view of a female die according to another embodiment; and

[0048] FIG. 13 illustrates a schematic detail view of FIG. 12.

DETAILED DESCRIPTION OF THE INVENTION

[0049] A stamping apparatus 1 according to the invention for stamping a material 2, in particular flat paper or cardboard webs comprises a machine frame 3, an upper part 4 with four stamping dies 5 configured as male dies 6 and a lower part 7 with four stamping tools 5o configured as a female die 8. Thus the upper part 4 is movably arranged relative to the machine frame 3. Furthermore the lower part 7 is fixed at the machine frame 3. Furthermore an intermediary space 9 is provided between the male die 6 and the female die 8, wherein the material 2 to be stamped can be run through the intermediary space 9 so that the material 2 is stampable by a relative movement between an upper part 4 and the lower part 7 due to an engagement of at least one stamping tool 5o of the upper part 4 with a stamping tool 5u of the lower part 7 (stamping position). Each stamping tool 5o, 5u includes a cutting element 10a, 10b that is disengageably connected at the stamping tool 5o, 5u and/or at the female die 8.

[0050] The upper part 4 is attached by four linear guides configured as guide pins 17 at the machine frame 3 so that the upper part 4 can be moved up and down. Furthermore the lower part 7 is attached at the machine frame 3 by bolts 16, so that the lower part is essentially fixed in place. Due to the support pins 17 the upper part 4 is centered relative to the machine frame 3 so that the upper part is movable on a precise path.

[0051] As evident from FIG. 3 the stamping dies 5 and the cutting elements 10a of the female die 8 are configured as a subassembly. This means that the female die 8 includes a cutting element 10c with four cutting edges 21, which, however are integrally provided in one piece. As illustrated in FIG. 3 this is a thin plate that forms four circular cutting edges 21. The plate is made from the same material all around, namely tool steel. The plate is connected with a carrier plate 22 arranged thereunder, wherein the carrier plate has a greater thickness than the cutting element 10b. The thin plate has a thickness of approximately 8 mm and has a thickness of approximately one inch together with the carrier plate 22. Accordingly the thinner plate is much thinner than the carrier plate 22, typically a thickness of the thinner plate is approximately 30% of a thickness of the carrier plate 22. The carrier plate 22 is made from a tool steel as well. The thin plate is bolted together with the carrier plate 22 and pinned, wherein the carrier plate 22 is bolted together and pinned with the machine frame 3.

[0052] The stamping tool 1 is configured to produce at least essentially circular blanks for paper plates. The material 2, e.g. paper or cardboard webs is fed into an intermediary space 9 in a direction 18. This is evident e.g. in FIG. 3. Thus, it is evident that the material 2 is moved above the lower part 7 and below the upper part 4. Put differently the material 2 is run between the lower part 7 and the upper part 4.

[0053] In order to stamp the material into a predetermined shape, in particular at least essentially a circle with a predetermined diameter the male die 6 is moved up and down in cycles and penetrates the female die 8 over and over again. Thus, the male die 6 engages the material 2 with its four cutting elements 10a and presses the material into the into the female die 8 including four cutouts respectively defined by a circumferential cutting edge 21 so that the material is cut and stamped. In order to facilitate the stamping the four cutting elements 10a of the male die 6 respectively have a diameter 15 that is slightly smaller than the diameter 16 of the female die. The cutting elements 10a of the male die 6 can at least partially penetrate the female die due to their diameter 15 that is smaller than a diameter 16 of the cutting edges. In order to hold the material 2 down during stamping so that the material 2 does not slide or compress a down holder 19 is provided which is essentially configured plate shaped. The down holder 19 is spring loaded and pressed the material 2 down before stamping so that it is engaged by the stamping die 5 without the material moving.

[0054] In order to be able to cut the material the stamping dies 5o and 5u respectively include a cutting element 10a, 10b. The cutting element 10a, 10b impacts the material 2 during stamping over and over again and cuts or stamps the material 2. In particular the stamping tool 5o of the male die 6 impacts the material 2 which is supported by the female die 8 in a downward direction. Thus, the material 2 runs through the intermediary space 9 in the direction 18 and partially rests on the female die 8 at least for a moment. The stamping tool 5o of the male die 6 impacts the material 2 from above so that the stamping tool contacts and engages the material at least with the cutting element 10a. Thereafter the material 2 is cut by the cutting element 10a or punched into the stamping tool 5u of the female die 8. Thus, the cutting element 10a and the cutting element 10b cooperate. Since large forces are at work, the cutting elements 10a, 10b wear overtime, in particular due to abrasion effects. Consequently, the cutting elements 10a, 10b have to be replaced or dismounted in order to be overhauled or exchanged.

[0055] In the instant embodiment the cutting elements 10a, 10b are fastened at the male die 6 and the female die 8 in a disengage able manner. This is evident from FIGS. 1, 2 and in particular FIG. 6. In the instant embodiment the cutting elements 10a, 10b terminate flush with a top side 13 of a respectively associated stamping tool 5o, 5u.

[0056] It is clearly evident from FIGS. 1 and 2 that the cutting element 10a is attachable by bolts 16 at the stamping tool 5o configured as the male die 6. The stamping tool 5o includes a base element 20. The base element 20 includes a centering element 24 configured in particular as a centering collar so that the cutting element 10a can be aligned at the centering collar. Thus, the cutting element 10a is arranged at the stamping tool 5 configured as the male die 6 so that the cutting element is also correctly aligned to cooperate with the female die 8, this means the male die 6 can engage and penetrate the female die 8. This also applies for the cutting element 10b at the stamping tool 5 configured as the female die 8 as evident from FIG. 3. Thus, the cutting element 10a, 10b can be replaced by itself when worn by loosening the bolt 16 and dismounting the cutting element 10a, 10b. In this context the cutting element 10a, 10b is disengaged from the base element 20 by loosening the bolts 16. Using the bolts 16 a new or overhauled cutting element 10a, 10b can be subsequently mounted without aligning the stamping tool 5 again. This is due to the fact that the male die 6 with the individual stamping tools is aligned before start up so that the male die 6 can engage the female die 8. Since the cutting element 10a, 10b can be mounted by the bolts 16 essentially without clearance, the male die 6 does not have to be realigned thereafter.

[0057] As evident from FIG. 2 the cutting element 10a is configured conical so that an enveloping line 10 encloses an angle 12 with an axis 11. This assures that the cutting element 10b can slide into the male die 8 with an undercut.

[0058] FIGS. 7-13 show an alternatively embodiment of the stamping apparatus 1 according to the invention. Differently from the embodiment, shown in FIG. 6 the female die 8 does not include a cutting element 10b with plural cutting edges 21 but plural cutting elements 10d respectively including a cutting edge 21. This is clearly evident from FIGS. 6 and 7 in combination. The plate shaped cutting element 10b shown in FIG. 6 is therefore omitted since the cutting elements 10d are inserted into the carrier plate 22 at least indirectly. Put differently plural cutting elements 10d are used that are arranged in the carrier plate 22 itself instead of a single plate shaped cutting element 10b that is arranged on the carrier plate 22 and that includes plural cutting edges 21.

[0059] It is evident from FIGS. 12 and 13 how the cutting elements 10d are arranged in the carrier plate 22. As shown in these drawing figures, the carrier plate 22 includes a centering recess 29. Furthermore a centering element 24 is provided which is configured annular and associated with each cutting element 10d, as illustrated in FIG. 12. In this context the centering recess 29 as well as the centering element 24 are configured annular or cylindrical, thus so that the centering element 24 can be arranged in the centering recess 29 or be inserted therein. Thus, the centering recess 29 is sized so that the centering element 24 has some clearance, thus so that it can be moved laterally.

[0060] FIG. 11 furthermore shows the centering element 24 includes a bolt receiver 30 configured to receive a bolt head. In the instant embodiment the bolt receiver 30 is configured to receive a bolt with a recessed flush cone head.

[0061] Accordingly the carrier plate 22 includes plural bolt receivers 31 where a bolt can be received or inserted. This way it is possible to connect, the centering element 24 with the carrier plate 22 namely by threading bolts through the bolt receivers 30 of the centering element 24 into the carrier plate 22. Consequently the carrier elements 24 can be arranged at the carrier plate 22 in a disengageable manner.

[0062] The centering element 24 and the cutting element 10d respectively include a corresponding fit so that the elements can be precisely aligned relative to each other. Thus, the centering element 24 includes a centering collar 28 where the cutting element 10d can be applied precisely fitted. This is shown clearly in FIG. 11. Put differently, the cutting element 10d is attached at least indirectly at or in the carrier plate 22, namely by the annular centering element 24.

[0063] As evident from FIGS. 12 and 13, the cutting elements 10d include four bolt receivers 32. These are evenly spaced about a circumference, this means at angular positions of 90 degrees, 180 degrees, 270 degrees and 360 degrees.

[0064] Additionally, the centering element 24 includes four pass through openings 33 which can be configured e.g. as pass through bore holes or threaded bore holes. These are circumferentially spaced at uniform increments, this means in particular at angular positions at 90 degrees, 180 degrees, 270 degrees and 360 degrees. This way the centering element 24 and the cutting element 10d are alignable relative to each other so that the bolt receivers 32 of the cutting element 10d are positioned exactly over the pass through openings 33 of the centering element 24. Additionally the bolt receivers 31 are arranged in the centering recess 29 of the carrier plate 22 at even circumferential increments, this means in particular at angular positions of 90 degrees, 180 degrees, 270 degrees and 360 degrees so that the bolt receivers 31 with the pass through openings 33 of the centering element 24 and the bolt receivers 32 of the cutting element 10d are arranged on top of each other. Put differently a bolt can be inserted through the bolt receiver 32 of the cutting element 10d through the pass through opening 33 of the centering element 24 and fastened through the bolt receiver 31 in the carrier plate. Thus, the cutting element 10d is attached at or in the carrier plate 22 at least indirectly. Furthermore the centering element 24 is connected with the carrier plate 22 by centering pins. Thus, the centering element 24 includes two centering bore holes 34 arranged opposite to each other and configured to receive the centering pins. The front centering bore hole 34 is clearly evident in FIG. 13 whereas the opposite centering hole is covered by the cutting element 10d.

[0065] In order for the cutting element 10c and the cutting element 10d to cooperate, the male die 6 and the female die 8 are aligned relative to each other. Furthermore the cutting element 10c is aligned relative to the male die 6 and the cutting element 10d is aligned relative to the female die 8.

[0066] Thus, the stamping tools 5o are initially inserted into the female die 8. Thus the stamping tool 5o is arranged inside the female die 8 so that it is arranged the same way as during operations, namely when the stamping tool 5o of the male die 6 penetrates the stamping tool 5u of the female die 8.

[0067] In this condition the centering element 24 can be aligned within the carrier plate 22 of the female die 8 and can be attached so that the stamping tool 5o and the centering element 24 or the cutting element 10d arranged thereon are aligned relative to one another for a minimum amount of friction. Thus, the stamping tool 5o is pulled just high enough so that it penetrates into the female die 8 by about 3 mm. This way the cutting edge 21 of the cutting element 10c contacts the cutting edge 21 of the cutting element 10d so that they are aligned relative to each other. In this condition the cutting edges 10c, 10d are aligned relative to each other in an optimum manner so that the position shall be fixed. Accordingly the centering element 24 is attached at the carrier plate 22 by threaded elements 26. Since the centering element 24 and the cutting element 10d include matched fits 25 aligning the centering element 24 fixes a position of the cutting element 10d at least indirectly.

[0068] Subsequently the upper stamping tools 5o are attached as determined during the alignment with the female die 8. For this purpose the male die 6 is moved up and rotated by the stamping device 1 so that it is easily accessible for an operator. Put differently the male die 6 can be rotated so that a bottom side is accessible. This way the stamping dies 50 can be permanently aligned relative to the male die by fits. The required fit bores can be produced by a magnet drill that is placed onto a bottom side of the male die 6 so that a bore hole can be introduced into the male die 6 accordingly. Fitting bore holes provided in the stamping tool 5o facilitate precise alignment of the stamping tool 5o relative to the male die 6. Since the stamping tool 5o is aligned relative to the male die 6 and the cutting element 10c is also precisely aligned relative to the stamping tool 5o by the fit 25 it is assured that the cutting element 10c is positioned precisely relative to the cutting element 10d and can cooperate therewith.

REFERENCE NUMERALS AND DESIGNATIONS

[0069] 1 stamping device [0070] 2 material [0071] 3 machine frame [0072] 4 upper part [0073] 5o stamping tool [0074] 5u stamping tool [0075] 6 male die [0076] 7 lower part [0077] 8 female die [0078] 9 intermediary space [0079] 10a cutting element [0080] 10b cutting element [0081] 10c cutting element [0082] 10d cutting element [0083] 10 enveloping line [0084] 11 axis [0085] 12 angle [0086] 13 top side [0087] 14 diameter stamping tool male die [0088] 15 diameter stamping tool female die [0089] 16 bolt [0090] 17 alignment pin [0091] 18 direction [0092] 19 down holder [0093] 20 base element [0094] 21 cutting edge [0095] 22 carrier plate [0096] 23 centering element [0097] 24 centering element [0098] 25 fit [0099] 26 threaded element [0100] 27 threaded element [0101] 28 centering collar [0102] 29 centering recess [0103] 30 bolt receiver (centering element) [0104] 31 bolt receiver (carrier plate) [0105] 32 bolt receiver (cutting element) [0106] 33 pass through opening (centering element) [0107] 34 centering bore hole